Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
  • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
  • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
  • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
  • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
  • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
  • B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
  • E21B17/01—Risers
  • E21B17/012—Risers with buoyancy elements

Definitions

• the invention relates to a floating offshore construction, comprising a
• suspension gear for suspending a riser construction.
• drilling ship or a semi-submersible is positioned on the water surface above
• drilling tools can be lowered and, during the exploitation,
• the riser construction is typically built up from riser segments which
• floating offshore construction be supported by legs on the seabottom, but is
• the offshore construction To enable the offshore construction to follow wave movements of the water surface relative to the riser construction, the
• suspension gear usually comprises a clamp coupling for receiving the riser
• the suspension gear should be of heavier design and the offshore construction
• the object of the invention is to provide an offshore construction of the
• the offshore construction according to the invention comprises a suspension gear having a guide which, during use, extends adjacent the water
• suspension gear can be reduced considerably, so that the suspension gear can be of a simpler
• the guide comprises a conduit
• the float comprises an elongated sleeve which is provided with a floating
• the floating chamber is accommodated in the
• controllable ballast means The effect thus achieved is that an upward or
• riser construction during lowering, can be lowered at a predetermined angle.
• the central bore has sidewalls which, relative to the longitudinal
• axis of the guide diverge in downward direction at an angle of 1-6°, preferably
• the sidewalls may be provided with a protection, for instance a
• the float is detachably connected to the
• the invention comprises a guide which is height-adjustable to a position above
• the guide can be adjusted to a position above the water surface, so
• invention also relates to a float.
• Fig. 1 is a schematic front view of a first embodiment of a floating
• Fig. 2a is a schematic front view of the float of the offshore
• Fig. 2b is a schematic top plan view of the float of Fig. 2a; Figs. 3a, 3b and 3c are each schematic front views of a second
• Fig. 4 is a schematic side elevation of a third embodiment of a floating
• Fig. 5 is a schematic side elevation of a fourth embodiment of a
• Fig. 1 shows a floating offshore construction 1, designed as semi-
• the semi-submersible comprises a working deck 2 connected to
• a riser construction 6 can be lowered, by means of
• the suspension gear 7 comprises a hoisting gear of the conventional
• segments 10 of the riser construction can be supplied from the working deck 2 in a
• the guide 11 is designed as a conduit of
• a float is accommodated in the guide 11 for axial
• float 12 is provided with a coupling device 13 for coupling to the riser
• the float 12 is
• the float 12 is shown therein.
• sleeve 15 of rectangular section, which sleeve 15 is closed adjacent
• the float 12 is provided
• construction 6 can pivot slightly relative to the float 12 about the pivotal axes 20 and 21. Since the central bore extends substantially transversely to the
• construction 6 are guided downwards at the proper angle.
• application 1008311 can advantageously be used, as they do not only have a
• buoyancy of their own but are also guarded adjacent the outer circumference
• the floating chamber 12 is provided with controllable ballast means
• controllable ballast means 22 as valves for supplying and discharging compressed air and water, the effect
• ballast means 22 an upward and downward movement of the float 12 within
• the guide 11 can be supported.
• the float 12 in the guide 11 by means of guide wheels 23 or similar guide members, the axial movement of the
• the float 12 is connected to the float 12 by means of the coupling device 13.
• the float 12 is connected to the float 12 by means of the coupling device 13.
• lighter design and the buoyancy of the floats 4 can be chosen to be
• the guide 11 absorbs forces substantially in or
• telescopic cylinders disposed on opposite sides of the riser, retract and extend
• floating offshore construction 1 according to the invention is shown therein.
• the floating offshore construction 1 is designed as semi-submersible.
• Fig. 3a shows the semi-submersible in the operating position
• Fig. 3b shows the semi-submersible in the operating position
• the guiding device 11 is connected to the offshore gear so as to be
• the guiding device 11 can be lifted with the float 12 to a position
• the float 12 is detachably connected to
• the floating offshore construction is designed as a drill ship.
• the drill
• the ship comprises a hull 25 and drive means 26.
• the hull 25 is of the type
• ballast means 22 and by means of the telescopic connecting means 14, after
• shut-off means not shown, in order to reduce the flow resistance of the hull 25
• the working ship comprises a hull 28
• the working deck 29 is connected to the hull 28 with settable intermediate distance, such
• the working ship is adjustable between a transport position in which the
• working deck 29 is located adjacent the hull 28, and a semi-submersed position
• the hull 28 is located substantially below the water line 5.
• guide conduit 31 acts as guide.
• the float and/or the guide is preferably
• the float may also be
• the float may comprise several parts. Moreover,
• the float may be designed without a bore for guiding the riser construction therethrough, for instance when the riser construction is passed along the
• the sidewalls of a central bore may extend outwards at a
• the guide may be designed other than as a guide
• conduit for instance as an open guide having a number of guide rails or as a
• winch cables running along pulleys or guideways such as winch cables running along pulleys or guideways.
• section of the float and the guide may be of oval
• section may even be circular when there is, for instance, provided a projection

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Life Sciences & Earth Sciences (AREA)
• Fluid Mechanics (AREA)
• Physics & Mathematics (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• Geochemistry & Mineralogy (AREA)
• Earth Drilling (AREA)
• Artificial Fish Reefs (AREA)
• Cleaning Or Clearing Of The Surface Of Open Water (AREA)
• Laying Of Electric Cables Or Lines Outside (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Moulding By Coating Moulds (AREA)
• Revetment (AREA)

Priority Applications (10)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19768668

Family Applications (1)

Country Status (16)

Cited By (4)

Families Citing this family (21)

Citations (3)

Family Cites Families (7)

• 1999
  • 1999-02-16 NL NL1011312A patent/NL1011312C1/nl not_active IP Right Cessation
• 2000
  • 2000-02-16 AU AU27000/00A patent/AU2700000A/en not_active Abandoned
  • 2000-02-16 US US09/913,620 patent/US6752213B1/en not_active Expired - Lifetime
  • 2000-02-16 PT PT00905466T patent/PT1169218E/pt unknown
  • 2000-02-16 DE DE60012003T patent/DE60012003T2/de not_active Expired - Lifetime
  • 2000-02-16 DK DK00905466T patent/DK1169218T3/da active
  • 2000-02-16 EP EP00905466A patent/EP1169218B1/de not_active Expired - Lifetime
  • 2000-02-16 ES ES00905466T patent/ES2223459T3/es not_active Expired - Lifetime
  • 2000-02-16 WO PCT/NL2000/000096 patent/WO2000048899A1/en active IP Right Grant
  • 2000-02-16 JP JP2000599650A patent/JP4545319B2/ja not_active Expired - Fee Related
  • 2000-02-16 AT AT00905466T patent/ATE270638T1/de not_active IP Right Cessation
  • 2000-02-16 BR BR0008303-8A patent/BR0008303A/pt not_active IP Right Cessation
  • 2000-02-16 KR KR1020017010415A patent/KR100634989B1/ko not_active IP Right Cessation
  • 2000-02-16 CA CA002362875A patent/CA2362875C/en not_active Expired - Fee Related
  • 2000-02-16 CN CNB008047618A patent/CN1139517C/zh not_active Expired - Fee Related
• 2001
  • 2001-08-16 NO NO20013980A patent/NO321327B1/no not_active IP Right Cessation

Patent Citations (3)

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